Method and device for signaling information related to TDD slot configuration in NR V2X

ABSTRACT

A method for performing wireless communication by a first device includes: receiving information related to a time division duplex (TDD) slot configuration, transmitting, to a second device, a sidelink-synchronization signal block (S-SSB), the S-SSB including a sidelink primary synchronization signal, a sidelink secondary synchronization signal, and a physical sidelink broadcast channel, and transmitting, to the second device, a physical sidelink shared channel based on the information related to the TDD slot configuration. Candidate resources to which a bitmap related to a sidelink resource pool is applied (i) are configured based on the information related to the TDD slot configuration and (ii) include one or more slots. Configuration information related to a sidelink symbol included in each of the one or more slots is received, the configuration information including information related to a position of the sidelink symbol configured to be the same for the candidate resources.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.17/957,695, filed on Sep. 30, 2022, which is a continuation of U.S.application Ser. No. 17/675,317, filed on Feb. 18, 2022, now U.S. Pat.No. 11,533,723, which is a continuation pursuant to 35 U.S.C. § 119(e)of International Application PCT/KR2020/013952, with an internationalfiling date of Oct. 13, 2020, which claims the benefit of U.S.Provisional Patent Application No. 62/914,543, filed on Oct. 13, 2019,Korean Patent Application No. 10-2019-0127350, filed on Oct. 14, 2019,Korean Patent Application No. 10-2019-0128707, filed on Oct. 16, 2019,and Korean Patent Application No. 10-2019-0141905, filed on Nov. 7,2019, the contents of which are hereby incorporated by reference hereinin their entirety.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

This disclosure relates to a wireless communication system.

Related Art

Sidelink (SL) communication is a communication scheme in which a directlink is established between User Equipments (UEs) and the UEs exchangevoice and data directly with each other without intervention of anevolved Node B (eNB). SL communication is under consideration as asolution to the overhead of an eNB caused by rapidly increasing datatraffic.

Vehicle-to-everything (V2X) refers to a communication technology throughwhich a vehicle exchanges information with another vehicle, apedestrian, an object having an infrastructure (or infra) establishedtherein, and so on. The V2X may be divided into 4 types, such asvehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I),vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2Xcommunication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require largercommunication capacities, the need for mobile broadband communicationthat is more enhanced than the existing Radio Access Technology (RAT) isrising. Accordingly, discussions are made on services and user equipment(UE) that are sensitive to reliability and latency. And, a nextgeneration radio access technology that is based on the enhanced mobilebroadband communication, massive Machine Type Communication (MTC),Ultra-Reliable and Low Latency Communication (URLLC), and so on, may bereferred to as a new radio access technology (RAT) or new radio (NR).Herein, the NR may also support vehicle-to-everything (V2X)communication.

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR. Theembodiment of FIG. 1 may be combined with various embodiments of thepresent disclosure.

Regarding V2X communication, a scheme of providing a safety service,based on a V2X message such as Basic Safety Message (BSM), CooperativeAwareness Message (CAM), and Decentralized Environmental NotificationMessage (DENM) is focused in the discussion on the RAT used before theNR. The V2X message may include position information, dynamicinformation, attribute information, or the like. For example, a UE maytransmit a periodic message type CAM and/or an event triggered messagetype DENM to another UE.

For example, the CAM may include dynamic state information of thevehicle such as direction and speed, static data of the vehicle such asa size, and basic vehicle information such as an exterior illuminationstate, route details, or the like. For example, the UE may broadcast theCAM, and latency of the CAM may be less than 100 ms. For example, the UEmay generate the DENM and transmit it to another UE in an unexpectedsituation such as a vehicle breakdown, accident, or the like. Forexample, all vehicles within a transmission range of the UE may receivethe CAM and/or the DENM. In this case, the DENM may have a higherpriority than the CAM.

Thereafter, regarding V2X communication, various V2X scenarios areproposed in NR. For example, the various V2X scenarios may includevehicle platooning, advanced driving, extended sensors, remote driving,or the like.

For example, based on the vehicle platooning, vehicles may move togetherby dynamically forming a group. For example, in order to perform platoonoperations based on the vehicle platooning, the vehicles belonging tothe group may receive periodic data from a leading vehicle. For example,the vehicles belonging to the group may decrease or increase an intervalbetween the vehicles by using the periodic data.

For example, based on the advanced driving, the vehicle may besemi-automated or fully automated. For example, each vehicle may adjusttrajectories or maneuvers, based on data obtained from a local sensor ofa proximity vehicle and/or a proximity logical entity. In addition, forexample, each vehicle may share driving intention with proximityvehicles.

For example, based on the extended sensors, raw data, processed data, orlive video data obtained through the local sensors may be exchangedbetween a vehicle, a logical entity, a UE of pedestrians, and/or a V2Xapplication server. Therefore, for example, the vehicle may recognize amore improved environment than an environment in which a self-sensor isused for detection.

For example, based on the remote driving, for a person who cannot driveor a remote vehicle in a dangerous environment, a remote driver or a V2Xapplication may operate or control the remote vehicle. For example, if aroute is predictable such as public transportation, cloud computingbased driving may be used for the operation or control of the remotevehicle. In addition, for example, an access for a cloud-based back-endservice platform may be considered for the remote driving.

Meanwhile, a scheme of specifying service requirements for various V2Xscenarios such as vehicle platooning, advanced driving, extendedsensors, remote driving, or the like is discussed in NR-based V2Xcommunication.

SUMMARY OF THE DISCLOSURE Technical Objects

Meanwhile, when the UE performs sidelink communication based on a timedivision duplex (TDD) operation, the base station may allocate some ofuplink (UL) slots/symbols, flexible slots/symbols, or downlink (DL)slots/symbols as sidelink slots/symbols. In this case, for example,in-coverage (INC) UEs may directly receive information related toconfiguration of a TDD slot corresponding to a UL slot/symbol, aflexible slot/symbol, a DL slot/symbol, or a sidelink slot/symbol amongall resources from the base station. Out-of-coverage (OOC) UEs maydetermine a sidelink slot/symbol based on information related topre-configured TDD slot configuration, and OOC UEs may perform sidelinkcommunication. Therefore, when the base station reconfigures informationrelated to the TDD slot configuration, which is different from theinformation related to the pre-configured TDD slot configuration, sinceinformation related to the TDD slot configuration is different betweenthe INC UE and the OOC UE, sidelink communication between the INC UE andthe OOC UE may be difficult.

Technical Solutions

According to an embodiment of the present disclosure, there is provideda method of performing wireless communication by a first device. Themethod may include receiving information related to a time divisionduplex (TDD) slot configuration, transmitting, to a second device, asidelink-synchronization signal block (S-SSB), wherein the S-SSBincludes a sidelink primary synchronization signal (S-PSS), a sidelinksecondary synchronization signal (S-SSS) and a physical sidelinkbroadcast channel (PSBCH), and transmitting, to the second device, aphysical sidelink shared channel (PSSCH) based on the informationrelated to the TDD slot configuration. For example, candidate resourcesto which a bitmap related to a sidelink resource pool is applied areconfigured based on the information related to the TDD slotconfiguration. For example, the candidate resources include one or moreslots. For example, configuration information related to a sidelinksymbol included in each of the one or more slots is received. Forexample, the configuration information related to the sidelink symbolincludes information related to a position of the sidelink symbol. Forexample, the position of the sidelink symbol is configured to be thesame for the candidate resources.

Effects of the Disclosure

A UE may effectively perform sidelink communication.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR.

FIG. 2 shows a structure of an NR system, in accordance with anembodiment of the present disclosure.

FIG. 3 shows a functional division between an NG-RAN and a 5GC, inaccordance with an embodiment of the present disclosure.

FIG. 4 shows a radio protocol architecture, in accordance with anembodiment of the present disclosure.

FIG. 5 shows a structure of an NR system, in accordance with anembodiment of the present disclosure.

FIG. 6 shows a structure of a slot of an NR frame, in accordance with anembodiment of the present disclosure.

FIG. 7 shows an example of a BWP, in accordance with an embodiment ofthe present disclosure.

FIG. 8 shows a radio protocol architecture for a SL communication, inaccordance with an embodiment of the present disclosure.

FIG. 9 shows a UE performing V2X or SL communication, in accordance withan embodiment of the present disclosure.

FIG. 10 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, in accordance with an embodiment of thepresent disclosure.

FIG. 11 shows three cast types, in accordance with an embodiment of thepresent disclosure.

FIG. 12 shows a procedure for a transmitting UE to transmit a PSSCH to areceiving UE based on information related to a TDD slot configuration,according to an embodiment of the present disclosure.

FIG. 13 shows an example in which a sidelink symbol is allocated in asidelink slot according to an embodiment of the present disclosure.

FIG. 14 shows an example of a slot excluded from a sidelink slotaccording to an embodiment of the present disclosure.

FIG. 15 shows a method for a first device to transmit a PSSCH to asecond device based on information related to a TDD slot configurationaccording to an embodiment of the present disclosure.

FIG. 16 shows a method for a second device to receive a PSSCH from afirst device based on information related to a TDD slot configurationaccording to an embodiment of the present disclosure.

FIG. 17 shows a communication system 1, in accordance with an embodimentof the present disclosure.

FIG. 18 shows wireless devices, in accordance with an embodiment of thepresent disclosure.

FIG. 19 shows a signal process circuit for a transmission signal, inaccordance with an embodiment of the present disclosure.

FIG. 20 shows a wireless device, in accordance with an embodiment of thepresent disclosure.

FIG. 21 shows a hand-held device, in accordance with an embodiment ofthe present disclosure.

FIG. 22 shows a car or an autonomous vehicle, in accordance with anembodiment of the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the present specification, “A or B” may mean “only A”, “only B” or“both A and B.” In other words, in the present specification, “A or B”may be interpreted as “A and/or B”. For example, in the presentspecification, “A, B, or C” may mean “only A”, “only B”, “only C”, or“any combination of A, B, C”.

A slash (/) or comma used in the present specification may mean“and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B”may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C”may mean “A, B, or C”.

In the present specification, “at least one of A and B” may mean “onlyA”, “only B”, or “both A and B”. In addition, in the presentspecification, the expression “at least one of A or B” or “at least oneof A and/or B” may be interpreted as “at least one of A and B”.

In addition, in the present specification, “at least one of A, B, and C”may mean “only A”, “only B”, “only C”, or “any combination of A, B, andC”. In addition, “at least one of A, B, or C” or “at least one of A, B,and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present specification may mean“for example”. Specifically, when indicated as “control information(PDCCH)”, it may mean that “PDCCH” is proposed as an example of the“control information”. In other words, the “control information” of thepresent specification is not limited to “PDCCH”, and “PDDCH” may beproposed as an example of the “control information”. In addition, whenindicated as “control information (i.e., PDCCH)”, it may also mean that“PDCCH” is proposed as an example of the “control information”.

A technical feature described individually in one figure in the presentspecification may be individually implemented, or may be simultaneouslyimplemented.

The technology described below may be used in various wirelesscommunication systems such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and so on. TheCDMA may be implemented with a radio technology, such as universalterrestrial radio access (UTRA) or CDMA-2000. The TDMA may beimplemented with a radio technology, such as global system for mobilecommunications (GSM)/general packet ratio service (GPRS)/enhanced datarate for GSM evolution (EDGE). The OFDMA may be implemented with a radiotechnology, such as institute of electrical and electronics engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA(E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16eand provides backward compatibility with a system based on the IEEE802.16e. The UTRA is part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTEuses the OFDMA in a downlink and uses the SC-FDMA in an uplink.LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a newClean-slate type mobile communication system having the characteristicsof high performance, low latency, high availability, and so on. 5G NRmay use resources of all spectrum available for usage including lowfrequency bands of less than 1 GHz, middle frequency bands ranging from1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more,and so on.

For clarity in the description, the following description will mostlyfocus on LTE-A or 5G NR. However, technical features according to anembodiment of the present disclosure will not be limited only to this.

FIG. 2 shows a structure of an NR system, in accordance with anembodiment of the present disclosure. The embodiment of FIG. 2 may becombined with various embodiments of the present disclosure.

Referring to FIG. 2 , a next generation-radio access network (NG-RAN)may include a BS 20 providing a UE 10 with a user plane and controlplane protocol termination. For example, the BS 20 may include a nextgeneration-Node B (gNB) and/or an evolved-NodeB (eNB). For example, theUE 10 may be fixed or mobile and may be referred to as other terms, suchas a mobile station (MS), a user terminal (UT), a subscriber station(SS), a mobile terminal (MT), wireless device, and so on. For example,the BS may be referred to as a fixed station which communicates with theUE 10 and may be referred to as other terms, such as a base transceiversystem (BTS), an access point (AP), and so on.

The embodiment of FIG. 2 exemplifies a case where only the gNB isincluded. The BSs 20 may be connected to one another via Xn interface.The BS 20 may be connected to one another via 5th generation (5G) corenetwork (5GC) and NG interface. More specifically, the BSs 20 may beconnected to an access and mobility management function (AMF) 30 viaNG-C interface, and may be connected to a user plane function (UPF) 30via NG-U interface.

FIG. 3 shows a functional division between an NG-RAN and a 5GC, inaccordance with an embodiment of the present disclosure.

Referring to FIG. 3 , the gNB may provide functions, such as Inter CellRadio Resource Management (RRM), Radio Bearer (RB) control, ConnectionMobility Control, Radio Admission Control, Measurement Configuration &Provision, Dynamic Resource Allocation, and so on. An AMF may providefunctions, such as Non Access Stratum (NAS) security, idle statemobility processing, and so on. A UPF may provide functions, such asMobility Anchoring, Protocol Data Unit (PDU) processing, and so on. ASession Management Function (SMF) may provide functions, such as userequipment (UE) Internet Protocol (IP) address allocation, PDU sessioncontrol, and so on.

Layers of a radio interface protocol between the UE and the network canbe classified into a first layer (L1), a second layer (L2), and a thirdlayer (L3) based on the lower three layers of the open systeminterconnection (OSI) model that is well-known in the communicationsystem. Among them, a physical (PHY) layer belonging to the first layerprovides an information transfer service by using a physical channel,and a radio resource control (RRC) layer belonging to the third layerserves to control a radio resource between the UE and the network. Forthis, the RRC layer exchanges an RRC message between the UE and the BS.

FIG. 4 shows a radio protocol architecture, in accordance with anembodiment of the present disclosure. The embodiment of FIG. 4 may becombined with various embodiments of the present disclosure.Specifically, FIG. 4(a) shows a radio protocol architecture for a userplane, and FIG. 4(b) shows a radio protocol architecture for a controlplane. The user plane corresponds to a protocol stack for user datatransmission, and the control plane corresponds to a protocol stack forcontrol signal transmission.

Referring to FIG. 4 , a physical layer provides an upper layer with aninformation transfer service through a physical channel. The physicallayer is connected to a medium access control (MAC) layer which is anupper layer of the physical layer through a transport channel. Data istransferred between the MAC layer and the physical layer through thetransport channel. The transport channel is classified according to howand with what characteristics data is transmitted through a radiointerface.

Between different physical layers, i.e., a physical layer of atransmitter and a physical layer of a receiver, data are transferredthrough the physical channel. The physical channel is modulated using anorthogonal frequency division multiplexing (OFDM) scheme, and utilizestime and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer,which is a higher layer of the MAC layer, via a logical channel. The MAClayer provides a function of mapping multiple logical channels tomultiple transport channels. The MAC layer also provides a function oflogical channel multiplexing by mapping multiple logical channels to asingle transport channel. The MAC layer provides data transfer servicesover logical channels.

The RLC layer performs concatenation, segmentation, and reassembly ofRadio Link Control Service Data Unit (RLC SDU). In order to ensurediverse quality of service (QoS) required by a radio bearer (RB), theRLC layer provides three types of operation modes, i.e., a transparentmode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM).An AM RLC provides error correction through an automatic repeat request(ARQ).

A radio resource control (RRC) layer is defined only in the controlplane. The RRC layer serves to control the logical channel, thetransport channel, and the physical channel in association withconfiguration, reconfiguration and release of RBs. The RB is a logicalpath provided by the first layer (i.e., the physical layer or the PHYlayer) and the second layer (i.e., the MAC layer, the RLC layer, and thepacket data convergence protocol (PDCP) layer) for data delivery betweenthe UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the userplane include user data delivery, header compression, and ciphering.Functions of a PDCP layer in the control plane include control-planedata delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in auser plane. The SDAP layer performs mapping between a Quality of Service(QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) markingin both DL and UL packets.

The configuration of the RB implies a process for specifying a radioprotocol layer and channel properties to provide a particular serviceand for determining respective detailed parameters and operations. TheRB can be classified into two types, i.e., a signaling RB (SRB) and adata RB (DRB). The SRB is used as a path for transmitting an RRC messagein the control plane. The DRB is used as a path for transmitting userdata in the user plane.

When an RRC connection is established between an RRC layer of the UE andan RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and,otherwise, the UE may be in an RRC_IDLE state. In case of the NR, anRRC_INACTIVE state is additionally defined, and a UE being in theRRC_INACTIVE state may maintain its connection with a core networkwhereas its connection with the BS is released.

Data is transmitted from the network to the UE through a downlinktransport channel. Examples of the downlink transport channel include abroadcast channel (BCH) for transmitting system information and adownlink-shared channel (SCH) for transmitting user traffic or controlmessages. Traffic of downlink multicast or broadcast services or thecontrol messages can be transmitted on the downlink-SCH or an additionaldownlink multicast channel (MCH). Data is transmitted from the UE to thenetwork through an uplink transport channel. Examples of the uplinktransport channel include a random access channel (RACH) fortransmitting an initial control message and an uplink SCH fortransmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of thetransport channel and mapped onto the transport channels include abroadcast channel (BCCH), a paging control channel (PCCH), a commoncontrol channel (CCCH), a multicast control channel (MCCH), a multicasttraffic channel (MTCH), etc.

The physical channel includes several OFDM symbols in a time domain andseveral sub-carriers in a frequency domain. One sub-frame includes aplurality of OFDM symbols in the time domain. A resource block is a unitof resource allocation, and consists of a plurality of OFDM symbols anda plurality of sub-carriers. Further, each subframe may use specificsub-carriers of specific OFDM symbols (e.g., a first OFDM symbol) of acorresponding subframe for a physical downlink control channel (PDCCH),i.e., an L1/L2 control channel. A transmission time interval (TTI) is aunit time of subframe transmission.

FIG. 5 shows a structure of an NR system, in accordance with anembodiment of the present disclosure. The embodiment of FIG. 5 may becombined with various embodiments of the present disclosure.

Referring to FIG. 5 , in the NR, a radio frame may be used forperforming uplink and downlink transmission. A radio frame has a lengthof 10 ms and may be defined to be configured of two half-frames (HFs). Ahalf-frame may include five 1 ms subframes (SFs). A subframe (SF) may bedivided into one or more slots, and the number of slots within asubframe may be determined in accordance with subcarrier spacing (SCS).Each slot may include 12 or 14 OFDM(A) symbols according to a cyclicprefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In caseof using an extended CP, each slot may include 12 symbols. Herein, asymbol may include an OFDM symbol (or CP-OFDM symbol) and a SingleCarrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM(DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols perslot (N^(slot) _(symb)), a number slots per frame (N^(frame,u) _(slot)),and a number of slots per subframe (N^(subframe,u) _(slot)) based on anSCS configuration (u), in a case where a normal CP is used.

TABLE 1 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot)N^(subframe, u) _(slot) 15 KHz (u = 0) 14 10 1 30 KHz (u = 1) 14 20 2 60KHz (u = 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u = 4) 14 160 16

Table 2 shows an example of a number of symbols per slot, a number ofslots per frame, and a number of slots per subframe in accordance withthe SCS, in a case where an extended CP is used.

TABLE 2 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot)N^(subframe, u) _(slot) 60 KHz (u = 2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on)between multiple cells being integrate to one UE may be differentlyconfigured. Accordingly, a (absolute time) duration (or section) of atime resource (e.g., subframe, slot or TTI) (collectively referred to asa time unit (TU) for simplicity) being configured of the same number ofsymbols may be differently configured in the integrated cells.

In the NR, multiple numerologies or SCSs for supporting diverse 5Gservices may be supported. For example, in case an SCS is 15 kHz, a widearea of the conventional cellular bands may be supported, and, in casean SCS is 30 kHz/60 kHz a dense-urban, lower latency, wider carrierbandwidth may be supported. In case the SCS is 60 kHz or higher, abandwidth that is greater than 24.25 GHz may be used in order toovercome phase noise.

An NR frequency band may be defined as two different types of frequencyranges. The two different types of frequency ranges may be FR1 and FR2.The values of the frequency ranges may be changed (or varied), and, forexample, the two different types of frequency ranges may be as shownbelow in Table 3. Among the frequency ranges that are used in an NRsystem, FR1 may mean a “sub 6 GHz range”, and FR2 may mean an “above 6GHz range” and may also be referred to as a millimeter wave (mmW).

TABLE 3 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  450 MHz-6000 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

As described above, the values of the frequency ranges in the NR systemmay be changed (or varied). For example, as shown below in Table 4, FR1may include a band within a range of 410 MHz to 7125 MHz. Morespecifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900,5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz(or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1mat include an unlicensed band. The unlicensed band may be used fordiverse purposes, e.g., the unlicensed band for vehicle-specificcommunication (e.g., automated driving).

TABLE 4 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  410 MHz-7125 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

FIG. 6 shows a structure of a slot of an NR frame, in accordance with anembodiment of the present disclosure.

Referring to FIG. 6 , a slot includes a plurality of symbols in a timedomain. For example, in case of a normal CP, one slot may include 14symbols. However, in case of an extended CP, one slot may include 12symbols. Alternatively, in case of a normal CP, one slot may include 7symbols. However, in case of an extended CP, one slot may include 6symbols.

A carrier includes a plurality of subcarriers in a frequency domain. AResource Block (RB) may be defined as a plurality of consecutivesubcarriers (e.g., 12 subcarriers) in the frequency domain. A BandwidthPart (BWP) may be defined as a plurality of consecutive (Physical)Resource Blocks ((P)RBs) in the frequency domain, and the BWP maycorrespond to one numerology (e.g., SCS, CP length, and so on). Acarrier may include a maximum of N number BWPs (e.g., 5 BWPs). Datacommunication may be performed via an activated BWP. Each element may bereferred to as a Resource Element (RE) within a resource grid and onecomplex symbol may be mapped to each element.

Meanwhile, a radio interface between a UE and another UE or a radiointerface between the UE and a network may consist of an L1 layer, an L2layer, and an L3 layer. In various embodiments of the presentdisclosure, the L1 layer may imply a physical layer. In addition, forexample, the L2 layer may imply at least one of a MAC layer, an RLClayer, a PDCP layer, and an SDAP layer. In addition, for example, the L3layer may imply an RRC layer.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in agiven numerology. The PRB may be selected from consecutive sub-sets ofcommon resource blocks (CRBs) for the given numerology on a givencarrier.

When using bandwidth adaptation (BA), a reception bandwidth andtransmission bandwidth of a UE are not necessarily as large as abandwidth of a cell, and the reception bandwidth and transmissionbandwidth of the BS may be adjusted. For example, a network/BS mayinform the UE of bandwidth adjustment. For example, the UE receiveinformation/configuration for bandwidth adjustment from the network/BS.In this case, the UE may perform bandwidth adjustment based on thereceived information/configuration. For example, the bandwidthadjustment may include an increase/decrease of the bandwidth, a positionchange of the bandwidth, or a change in subcarrier spacing of thebandwidth.

For example, the bandwidth may be decreased during a period in whichactivity is low to save power. For example, the position of thebandwidth may move in a frequency domain. For example, the position ofthe bandwidth may move in the frequency domain to increase schedulingflexibility. For example, the subcarrier spacing of the bandwidth may bechanged. For example, the subcarrier spacing of the bandwidth may bechanged to allow a different service. A subset of a total cell bandwidthof a cell may be called a bandwidth part (BWP). The BA may be performedwhen the BS/network configures the BWP to the UE and the BS/networkinforms the UE of the BWP currently in an active state among theconfigured BWPs.

For example, the BWP may be at least any one of an active BWP, aninitial BWP, and/or a default BWP. For example, the UE may not monitordownlink radio link quality in a DL BWP other than an active DL BWP on aprimary cell (PCell). For example, the UE may not receive PDCCH, PDSCH,or CSI-RS (excluding RRM) outside the active DL BWP. For example, the UEmay not trigger a channel state information (CSI) report for theinactive DL BWP. For example, the UE may not transmit PUCCH or PUSCHoutside an active UL BWP. For example, in a downlink case, the initialBWP may be given as a consecutive RB set for an RMSI CORESET (configuredby PBCH). For example, in an uplink case, the initial BWP may be givenby SIB for a random access procedure. For example, the default BWP maybe configured by a higher layer. For example, an initial value of thedefault BWP may be an initial DL BWP. For energy saving, if the UE failsto detect DCI during a specific period, the UE may switch the active BWPof the UE to the default BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used intransmission and reception. For example, a transmitting UE may transmitan SL channel or an SL signal on a specific BWP, and a receiving UE mayreceive the SL channel or the SL signal on the specific BWP. In alicensed carrier, the SL BWP may be defined separately from a Uu BWP,and the SL BWP may have configuration signaling separate from the UuBWP. For example, the UE may receive a configuration for the SL BWP fromthe BS/network. The SL BWP may be (pre-)configured in a carrier withrespect to an out-of-coverage NR V2X UE and an RRC_IDLE UE. For the UEin the RRC_CONNECTED mode, at least one SL BWP may be activated in thecarrier.

FIG. 7 shows an example of a BWP, in accordance with an embodiment ofthe present disclosure. The embodiment of FIG. 7 may be combined withvarious embodiments of the present disclosure. It is assumed in theembodiment of FIG. 7 that the number of BWPs is 3.

Referring to FIG. 7 , a common resource block (CRB) may be a carrierresource block numbered from one end of a carrier band to the other endthereof. In addition, the PRB may be a resource block numbered withineach BWP. A point A may indicate a common reference point for a resourceblock grid.

The BWP may be configured by a point A, an offset N^(start) _(BWP) fromthe point A, and a bandwidth N^(size) _(BWP). For example, the point Amay be an external reference point of a PRB of a carrier in which asubcarrier 0 of all numerologies (e.g., all numerologies supported by anetwork on that carrier) is aligned. For example, the offset may be aPRB interval between a lowest subcarrier and the point A in a givennumerology. For example, the bandwidth may be the number of PRBs in thegiven numerology.

Hereinafter, V2X or SL communication will be described.

FIG. 8 shows a radio protocol architecture for a SL communication, inaccordance with an embodiment of the present disclosure. The embodimentof FIG. 8 may be combined with various embodiments of the presentdisclosure. More specifically, FIG. 8(a) shows a user plane protocolstack, and FIG. 8(b) shows a control plane protocol stack.

Hereinafter, a sidelink synchronization signal (SLSS) andsynchronization information will be described.

The SLSS may include a primary sidelink synchronization signal (PSSS)and a secondary sidelink synchronization signal (SSSS), as anSL-specific sequence. The PSSS may be referred to as a sidelink primarysynchronization signal (S-PSS), and the SSSS may be referred to as asidelink secondary synchronization signal (S-SSS). For example,length-127 M-sequences may be used for the S-PSS, and length-127 goldsequences may be used for the S-SSS. For example, a UE may use the S-PSSfor initial signal detection and for synchronization acquisition. Forexample, the UE may use the S-PSS and the S-SSS for acquisition ofdetailed synchronization and for detection of a synchronization signalID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast)channel for transmitting default (system) information which must befirst known by the UE before SL signal transmission/reception. Forexample, the default information may be information related to SLSS, aduplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL)configuration, information related to a resource pool, a type of anapplication related to the SLSS, a subframe offset, broadcastinformation, or the like. For example, for evaluation of PSBCHperformance, in NR V2X, a payload size of the PSBCH may be 56 bitsincluding 24-bit CRC.

The S-PSS, the S-SSS, and the PSBCH may be included in a block format(e.g., SL synchronization signal (SS)/PSBCH block, hereinafter,sidelink-synchronization signal block (S-SSB)) supporting periodicaltransmission. The S-SSB may have the same numerology (i.e., SCS and CPlength) as a physical sidelink control channel (PSCCH)/physical sidelinkshared channel (PSSCH) in a carrier, and a transmission bandwidth mayexist within a (pre-)configured sidelink (SL) BWP. For example, theS-SSB may have a bandwidth of 11 resource blocks (RBs). For example, thePSBCH may exist across 11 RBs. In addition, a frequency position of theS-SSB may be (pre-)configured. Accordingly, the UE does not have toperform hypothesis detection at frequency to discover the S-SSB in thecarrier.

FIG. 9 shows a UE performing V2X or SL communication, in accordance withan embodiment of the present disclosure. The embodiment of FIG. 9 may becombined with various embodiments of the present disclosure.

Referring to FIG. 9 , in V2X or SL communication, the term ‘UE’ maygenerally imply a UE of a user. However, if a network equipment such asa BS transmits/receives a signal according to a communication schemebetween UEs, the BS may also be regarded as a sort of the UE. Forexample, a UE 1 may be a first apparatus 100, and a UE 2 may be a secondapparatus 200.

For example, the UE 1 may select a resource unit corresponding to aspecific resource in a resource pool which implies a set of series ofresources. In addition, the UE 1 may transmit an SL signal by using theresource unit. For example, a resource pool in which the UE 1 is capableof transmitting a signal may be configured to the UE 2 which is areceiving UE, and the signal of the UE 1 may be detected in the resourcepool.

Herein, if the UE 1 is within a connectivity range of the BS, the BS mayinform the UE 1 of the resource pool. Otherwise, if the UE 1 is out ofthe connectivity range of the BS, another UE may inform the UE 1 of theresource pool, or the UE 1 may use a pre-configured resource pool.

In general, the resource pool may be configured in unit of a pluralityof resources, and each UE may select a unit of one or a plurality ofresources to use it in SL signal transmission thereof.

Hereinafter, resource allocation in SL will be described.

FIG. 10 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, in accordance with an embodiment of thepresent disclosure. The embodiment of FIG. 10 may be combined withvarious embodiments of the present disclosure. In various embodiments ofthe present disclosure, the transmission mode may be called a mode or aresource allocation mode. Hereinafter, for convenience of explanation,in LTE, the transmission mode may be called an LTE transmission mode. InNR, the transmission mode may be called an NR resource allocation mode.

For example, FIG. 10(a) shows a UE operation related to an LTEtransmission mode 1 or an LTE transmission mode 3. Alternatively, forexample, FIG. 10(a) shows a UE operation related to an NR resourceallocation mode 1. For example, the LTE transmission mode 1 may beapplied to general SL communication, and the LTE transmission mode 3 maybe applied to V2X communication.

For example, FIG. 10(b) shows a UE operation related to an LTEtransmission mode 2 or an LTE transmission mode 4. Alternatively, forexample, FIG. 10(b) shows a UE operation related to an NR resourceallocation mode 2.

Referring to FIG. 10(a), in the LTE transmission mode 1, the LTEtransmission mode 3, or the NR resource allocation mode 1, a BS mayschedule an SL resource to be used by the UE for SL transmission. Forexample, the BS may perform resource scheduling to a UE 1 through aPDCCH (more specifically, downlink control information (DCI)), and theUE 1 may perform V2X or SL communication with respect to a UE 2according to the resource scheduling. For example, the UE 1 may transmita sidelink control information (SCI) to the UE 2 through a physicalsidelink control channel (PSCCH), and thereafter transmit data based onthe SCI to the UE 2 through a physical sidelink shared channel (PSSCH).

Referring to FIG. 10(b), in the LTE transmission mode 2, the LTEtransmission mode 4, or the NR resource allocation mode 2, the UE maydetermine an SL transmission resource within an SL resource configuredby a BS/network or a pre-configured SL resource. For example, theconfigured SL resource or the pre-configured SL resource may be aresource pool. For example, the UE may autonomously select or schedule aresource for SL transmission. For example, the UE may perform SLcommunication by autonomously selecting a resource within a configuredresource pool. For example, the UE may autonomously select a resourcewithin a selective window by performing a sensing and resource(re)selection procedure. For example, the sensing may be performed inunit of subchannels. In addition, the UE 1 which has autonomouslyselected the resource within the resource pool may transmit the SCI tothe UE 2 through a PSCCH, and thereafter may transmit data based on theSCI to the UE 2 through a PSSCH.

FIG. 11 shows three cast types, in accordance with an embodiment of thepresent disclosure. The embodiment of FIG. 11 may be combined withvarious embodiments of the present disclosure. Specifically, FIG. 11(a)shows broadcast-type SL communication, FIG. 11(b) shows unicast type-SLcommunication, and FIG. 11(c) shows groupcast-type SL communication. Incase of the unicast-type SL communication, a UE may perform one-to-onecommunication with respect to another UE. In case of the groupcast-typeSL transmission, the UE may perform SL communication with respect to oneor more UEs in a group to which the UE belongs. In various embodimentsof the present disclosure, SL groupcast communication may be replacedwith SL multicast communication, SL one-to-many communication, or thelike.

Meanwhile, in various embodiments of the present disclosure, forexample, “configuration” or “definition” may mean (pre-) configurationfrom a base station or a network. For example, “configuration” or“definition” may mean resource pool specific (pre-) configuration from abase station or a network via predefined signaling (e.g., SIB, MAC, RRC,etc.).

Meanwhile, in various embodiments of the present disclosure, forexample, since the RLF may be determined based on the OUT-OF-SYNCH (OOS)indicator or the IN-SYNCH (IS) indicator, it may be replaced/substitutedwith OUT-OF-SYNCH (OOS) or IN-SYNCH (IS).

Meanwhile, in various embodiments of the present disclosure, resourcesmay be interchanged/replaced with slots or symbols. For example,resources may include slots and/or symbols.

Meanwhile, in various embodiments of the present disclosure, the Uuchannel may include a UL channel and/or a DL channel. For example, theUL channel may include a PUSCH, a PUCCH, and the like. For example, theDL channel may include a PDCCH, a PDSCH, and the like. For example, theSL channel may include PSCCH, PSSCH, PSFCH, PSBCH, and the like.

Meanwhile, in various embodiments of the present disclosure, thesidelink information may include at least one of a sidelink message, asidelink packet, a sidelink service, sidelink data, sidelink controlinformation, and/or a sidelink transport block (TB). For example, thesidelink information may be transmitted through a PSSCH and/or a PSCCH.

Meanwhile, when the UE performs sidelink communication based on a TDDoperation, the base station may allocate some of the UL slots/symbols,flexible slots/symbols, or DL slots/symbols as sidelink slots/symbols.In this case, for example, in-coverage (INC) UEs may directly receiveinformation related to configuration of a TDD slot corresponding to a ULslot/symbol, a flexible slot/symbol, a DL slot/symbol, or a sidelinkslot/symbol among all resources from the base station. Out-of-coverage(OOC) UEs may determine a sidelink slot/symbol based on informationrelated to pre-configured TDD slot configuration, and OOC UEs mayperform sidelink communication. Therefore, when the base stationreconfigures information related to the TDD slot configuration, which isdifferent from the information related to the pre-configured TDD slotconfiguration, since information related to the TDD slot configurationis different between the INC UE and the OOC UE, sidelink communicationbetween the INC UE and the OOC UE may be difficult.

The present disclosure proposes a method of transmitting informationrelated to a TDD slot configuration through a PSBCH payload in S-SSB,which is used as a synchronization signal in sidelink communication.According to the proposed method, for example, an OOC UE may select anINC UE as a reference synchronization source. The OOC UE may receiveinformation related to the changed TDD slot configuration through thePSBCH payload in the S-SSB transmitted by the INC UE. The OOC UE againtransmits information related to the changed TDD slot configuration tonearby devices, as a result, same information related to the TDD slotconfiguration may be used between the OOC UE and the INC UE.

For example, the PSBCH payload may be configured with an MIB configuredby a higher layer and a part configured by a physical layer.Hereinafter, in the present specification, the two parts may becollectively referred to as a PSBCH payload. For example, resources forsidelink communication may be divided into resources for transmittingthe S-SSB and resources for transmitting other channels such as aPSCCH/PSSCH/PSFCH. In the case of resources for transmitting otherchannels such as a PSCCH/PSSCH/PSFCH, the base station may configureresources for transmitting other channels, such as a PSCCH/PSSCH/PSFCHthrough a configuration related to a sidelink resource pool. Inaddition, the UEs may transmit and receive configuration informationrelated to the sidelink resource pool between the UEs. Hereinafter,various embodiments related to a method for the UE to transmitinformation related to a TDD slot configuration through a PSBCH will bedescribed.

According to an embodiment of the present disclosure, the UE may excluderesources for transmitting a S-SSB from a sidelink resource pool, andmay transmit the S-SSB independently. For example, resources in afrequency domain and a time domain for transmitting the S-SSB may bepre-configured by a higher layer signaling. For example, resources fortransmitting other channels such as a PSCCH/PSSCH/PSFCH other than theS-SSB may be pre-configured as a sidelink resource pool by a higherlayer signaling.

For example, the UE may transmit information related to a pre-configuredsidelink resource pool by a higher layer signaling through a PSBCH. Forexample, the UE may transmit information related to a pre-configuredsidelink resource pool in a form of a bit map. For example, the sidelinkresource pool may be pre-configured by a higher layer signaling, and theUE may transmit information for slots/symbols to which the sidelinkresource pool can be applied among information related to total TDDslots configuration through a PSBCH. For example, the UE may transmitinformation on slots/symbols to which a sidelink resource pool can beapplied among information related to total TDD slots configuration in aform of a bitmap through a PSBCH. In this case, for example, the bit mapmay be configured to the subframe level, the slot level, or the symbollevel.

In this way, when a S-SSB is excluded from a sidelink resource pool, forexample, the UE may transmit the S-SSB through all symbols of a slotallocated for sidelink communication. In addition, the UE may transmitthe remaining sidelink communication-related signals through all symbolsor some symbols of the slots allocated to the sidelink communication. Inthis case, for example, all sidelink slots except for the resources fortransmitting the S-SSB may be pre-configured to use the same number ofsymbols. In this case, for example, positions of symbols in one sidelinkslot may be transmitted to the UE. For example, positions of symbols inone sidelink slot may be transmitted to the UE as a bit map of a symbollevel.

Accordingly, the UE may transmit information related to total TDD slotsconfiguration including all UL/flexible/DL/sidelink resources through aPSBCH. In addition, information related to a sidelink resource pool maybe transmitted to the UE through a higher layer signaling.Alternatively, the UE may directly transmit information related to asidelink resource pool through a PSBCH.

According to an embodiment of the present disclosure, a S-SSB may bepre-configured for the UE to include configuration information relatedto a sidelink resource pool. For example, the UE may use all symbols ina slot as resources for sidelink communication. For example, the UE mayuse some symbols in a slot as resources for sidelink communication. Forexample, when the UE always uses all symbols in one slot to transmit aS-SSB, exceptionally, the UE may use all symbols of the slot fortransmitting the S-SSB regardless of configuration information relatedto a sidelink resource pool.

According to an embodiment of the present disclosure, when only somesymbols are used for sidelink communication in a slot used for thesidelink communication, the UE may signal positions of sidelink symbolsin one slot through the PSBCH using a bit map. For example, to reducesignaling overhead, by joint encoding the position of the start symbol(S) and the number of sidelink symbols (L), the positions of sidelinksymbols may be transmitted. In this case, all sidelink symbols in oneslot may be continuously located.

For example, the maximum number of symbols in one slot may be Lmax. Forexample, in the case of Equation 1 below, when a normal CP length isused, Lmax=14, and when an extended CP length is used, Lmax=12. As shownin Table 5 below, for example, when the UE uses a joint encoding (Startand Length Indication Value, (SLIV)), signaling overhead can be reduced.

TABLE 5   ${{if}( {L - 1} )} \leq \frac{L_{\max}}{2}$ SLIV =L_(max)(L − 1) + S else SLIV =L_(max)(L_(max) − L + 1) + (L_(max) − 1 −S)

In this case, for example, a bit value required for joint encoding maybe determined as in Equation 1 below. For example, in the case of theabove-described embodiment, a total of 7 bits may be required.

$\begin{matrix}\lceil {\log_{2}( \frac{L_{\max}( {L_{\max} + 1} )}{2} )} \rceil & \lbrack {{Equation}1} \rbrack\end{matrix}$

For example, symbols for sidelink communication may always start from astart symbol of a slot. For example, symbols for sidelink communicationmay always end in a last symbol of a slot. In this case, the UE mayinform only information related to the number of symbols withoutnotifying information on a position of a start symbol. In this case, forexample, since a maximum value of the number of symbols in one slot is14, by using a total of 4 bits, the UE may signal information related toa structure of the sidelink slot.

According to an embodiment of the present disclosure, the UE maytransmit information on positions of sidelink slots for sidelinkcommunication among all slots in a time domain forUL/flexible/DL/sidelink communication through a PSBCH. In addition, foreach of the sidelink slots, information on a position of a sidelinksymbol for sidelink communication among all symbols in the sidelink slotmay be pre-configured for the UE. For example, the UE may transmitinformation on positions of sidelink slots for sidelink communicationamong all slots for UL/flexible/DL/sidelink communication through PSBCH,the UE may transmit information on positions of sidelink symbols amongall symbols included in the sidelink slot for every sidelink slot.Hereinafter, for example, a pre-configured value may be a configurationvalue installed when manufacturing a product or a value transmitted froma server or a network device in advance. For example, a pre-configuredinformation may be configuration information that OOC UEs can beinstalled and used in advance even without a connection with a basestation (e.g., connection with a base station through a relay of adifferent UE).

According to an embodiment of the present disclosure, information onpositions of sidelink slots for sidelink communication among all slotsin a time domain for UL/flexible/DL/sidelink communication may bepre-configured for the UE. In addition, the UE may use pre-configuredinformation on positions of sidelink slots. For example, the UE maytransmit information on positions of sidelink symbols for sidelinkcommunication among all symbols in the sidelink slot for every sidelinkslot through a PSBCH. For example, information on positions of sidelinkslots among all slots for UL/flexible/DL/sidelink communication may bepre-configured for the UE. For example, the UE may transmit informationon positions of sidelink symbols among all symbols in the sidelink slotfor every sidelink slot through a PSBCH.

In this case, for example, as information on the positions of sidelinkslots or sidelink symbols, a bit map indicating a specific positionwithin one period may be used.

For example, it can be assumed that sidelink slots or sidelink symbolsare transmitted continuously at any location. In this case, the UE mayinform a position of a start slot or a start symbol and the number ofconsecutive slots or consecutive symbols through joint encoding. Forexample, it may be assumed that consecutive slots or consecutive symbolsalways starting from a start slot or start symbol are transmitted withinone period or slot. In this case, the UE may inform only the number ofconsecutive slots or consecutive symbols. For example, it may be assumedthat consecutive slots or consecutive symbols always including a lastslot or a last symbol are always transmitted within one period or slot.In this case, the UE may inform only the number of consecutive slots orconsecutive symbols. For example, when the UE informs only the number ofconsecutive slots or consecutive slots, the UE may signal whether itincludes the start slot or the start symbol or the last slot or the lastsymbol within one period or slot. For example, while transmittinginformation on the number of consecutive slots or consecutive slots, theUE may separately signal whether it includes a start slot or a startsymbol or a last slot or a last symbol within one period or slot.

According to an embodiment of the present disclosure, configurationinformation may include information related to a TDD slot configurationclassified as UL, DL, and flexible use by the base station for all slots(hereinafter, a first information), information related to configurationof a candidate slot that can be used for sidelink communication withrespect to the TDD slot configuration of the first information(hereinafter, a second information), information related toconfiguration of a sidelink slot constituting an arbitrary resource poolwith respect to the candidate sidelink slot configuration of the secondinformation (hereinafter, a third information), information related toconfiguration of a sidelink symbol to be applied to each slot withrespect to the candidate sidelink slot configuration of the secondinformation (hereinafter, a fourth information), and information relatedto configuration of a sidelink symbol to be applied to each slot withrespect to the sidelink slot configuration constituting the resourcepool of the third information (hereinafter, a fifth information). Forexample, the candidate slot may replace one or more candidate slots.

For example, in the configuration information, information related to aresource pool configuration may be configured to a pre-configured valuefor the UE by a higher layer signaling, and a common configuration toall resource pools at the system-level may be pre-configured for the UE.In addition, the UE may transmit a common configuration to all resourcepools through a PSBCH payload.

For example, information related to a resource pool configuration may bepre-configured for the UE, the UE may transmit the information relatedto the resource pool configuration through a PSBCH payload. And, acommon configuration to all resource pools at the system-level may beconfigured for the UE as a pre-configured value by a higher layersignaling.

According to an embodiment of the present disclosure, the UE maytransmit each of a pre-configured value and a PSBCH payload as resourcepool information. For example, the third information and the fifthinformation may be configured to a pre-configured value as resource poolinformation. For example, the UE may configure the third information andthe fifth information to a pre-configured value as resource poolinformation. And, the UE transmits the first information, the secondinformation and the fourth information through the PSBCH payload. Or, bycombining the first information and the second information, the UE maytransmit a configuration for a candidate slot to which sidelinkcommunication can be applied among all slots. For example, the candidateslot may replace one or more candidate slots.

For example, the UE may transmit the third information and the fifthinformation through the PSBCH payload. In addition, the firstinformation, the second information, and the fourth information may beconfigured to a pre-configured value as resource pool information. Forexample, by combining the first information and the second information,a configuration for a candidate slot to which sidelink communication canbe applied among all slots may be configured to a pre-configured valueas resource pool information. For example, the UE may configure thefirst information, the second information, and the fourth information toa pre-configured value as resource pool information. For example, bycombining the first information and the second information, the UE mayconfigure a configuration for a candidate slot to which sidelinkcommunication can be applied among all slots to a pre-configured valueas resource pool information. For example, the candidate slot mayreplace one or more candidate slots.

According to an embodiment of the present disclosure, all of the secondinformation, the third information, the fourth information, and thefifth information, which are configuration information related tosidelink communication, may be configured to a pre-configured value asresource pool information. For example, the UE may configure the secondinformation, the third information, the fourth information, and thefifth information to a pre-configured value as resource poolinformation. And, the UE may transmit the first information through thePSBCH.

For example, the UE may transmit all of the second information, thethird information, the fourth information, and the fifth informationthat are configuration information related to sidelink communicationthrough the PSBCH. And, the UE may configure the first information to apre-configured value as resource pool information. For example, thefirst information may be configured to a pre-configured value asresource pool information.

According to an embodiment of the present disclosure, for all sidelinkslots used for sidelink communication, the same sidelink symbolconfiguration may be applied. For example, the UE may apply the samesidelink symbol configuration to all sidelink slots used for sidelinkcommunication. For example, the all of the sidelink slots may besidelink slots in which S-SSB related resources are excluded. And, bycombining the fourth information and the fifth information, the UE mayconfigure the sidelink symbol configuration.

For example, the UE may configure the third information to apre-configured value as resource pool information. For example, thethird information may be configured to a pre-configured value asresource pool information. And, the UE may transmit the firstinformation and the second information through the PSBCH payload. Forexample, by combining the first information and the second informationthrough the PSBCH payload, the UE may transmit a configuration for acandidate slot to which sidelink communication can be applied among allslots. And, the UE may transmit the fourth information and the fifthinformation through the PSBCH payload. For example, the UE may transmita common sidelink symbol configuration applied to all sidelink slots bycombining the fourth information and the fifth information through thePSBCH payload. For example, the all sidelink slots may be sidelink slotsin which S-SSB related resources are excluded. For example, thecandidate slot may replace one or more candidate slots.

For example, the UE may transmit the third information through the PSBCHpayload. And, for example, the UE may configure the first informationand the second information to a pre-configured value as resource poolinformation. For example, by combining the first information and thesecond information, the UE may configure a candidate slot to whichsidelink communication can be applied among all slots to apre-configured value as resource pool information. And, for example, theUE may configure the fourth information and the fifth information to apre-configured value as resource pool information. For example, bycombining the fourth information and the fifth information, the UE mayconfigure a common sidelink symbol configuration applied to all sidelinkslots to a pre-configured value as resource pool information. Forexample, the all sidelink slots may be sidelink slots in which S-SSBrelated resources are excluded. For example, the first information andthe second information may be configured to a pre-configured value asresource pool information. For example, by combining the firstinformation and the second information, a candidate slot to whichsidelink communication can be applied among all slots may be configuredto a pre-configured value as resource pool information. And, forexample, the fourth information and the fifth information may beconfigured to a pre-configured value as resource pool information. Forexample, by combining the fourth information and the fifth information,a common sidelink symbol configuration applied to all sidelink slots maybe configured to a pre-configured value as resource pool information.For example, the all sidelink slots may be sidelink slots in which S-SSBrelated resources are excluded. For example, the candidate slot mayreplace one or more candidate slots.

According to an embodiment of the present disclosure, information onsidelink slot configuration and information on sidelink symbolconfiguration may be transmitted, respectively. For example, the UE mayconfigure the first information, the second information, and the thirdinformation to a pre-configured value as resource pool information. Forexample, by combining the first information and the second information,the UE may configure a candidate slot to which sidelink communicationcan be applied among all slots as a pre-configured value as resourcepool information. For example, the first information, the secondinformation, and the third information may be configured to apre-configured value as resource pool information. For example, bycombining the first information and the second information, a candidateslot to which sidelink communication can be applied among all slots maybe configured as a pre-configured value as resource pool information.And, for example, the UE may transmit the fourth information and thefifth information through the PSBCH payload. For example, the UE maytransmit a common sidelink symbol configuration applied to all sidelinkslots by combining the fourth information and the fifth informationthrough the PSBCH payload. For example, the all sidelink slots may besidelink slots in which S-SSB related resources are excluded. Forexample, the candidate slot may replace one or more candidate slots.

For example, the UE may transmit the first information, the secondinformation, and the third information through the PSBCH payload. Forexample, by combining the first information and the second informationthrough the PSBCH payload, the UE may transmit a configuration for acandidate slot to which sidelink communication can be applied among allslots. And, for example, the UE may configure the fourth information andthe fifth information to a pre-configured value as resource poolinformation. For example, by combining the fourth information and thefifth information, the UE may configure a common sidelink symbolconfiguration applied to all sidelink slots to a pre-configured value asresource pool information. For example, the all sidelink slots may besidelink slots in which S-SSB related resources are excluded. Forexample, the fourth information and the fifth information may beconfigured to a pre-configured value as resource pool information. Forexample, by combining the fourth information and the fifth information,a common sidelink symbol configuration applied to all sidelink slots maybe configured to a pre-configured value as resource pool information.For example, the candidate slot may replace one or more candidate slots.

According to an embodiment of the present disclosure, configuration by apre-configured value as resource pool information and transmission usinga PSBCH payload may be performed. For example, the UE may configure thefirst information and the second information to a pre-configured valueas resource pool information. For example, by combining the firstinformation and the second information, the UE may configure a candidateslot to which sidelink communication can be applied among all slots as apre-configured value as resource pool information. For example, thefirst information and the second information may be configured to apre-configured value as resource pool information. For example, bycombining the first information and the second information, a candidateslot to which sidelink communication can be applied among all slots maybe configured as a pre-configured value as resource pool information. Inaddition, For example, the UE may transmit the third information, thefourth information, and the fifth information through the PSBCH payload.For example, the UE may transmit a common sidelink symbol configurationapplied to all sidelink slots by combining the fourth information andthe fifth information through the PSBCH payload. For example, the allsidelink slots may be sidelink slots in which S-SSB related resourcesare excluded. For example, the candidate slot may replace one or morecandidate slots.

For example, the UE may transmit the first information and the secondinformation through the PSBCH payload. For example, by combining thefirst information and the second information through the PSBCH payload,the UE may transmit a configuration for a candidate slot to whichsidelink communication can be applied among all slots. And, for example,the UE may configure the third information, the fourth information, andthe fifth information to a pre-configured value as resource poolinformation. For example, by combining the fourth information and thefifth information, the UE may configure a common sidelink symbolconfiguration applied to all sidelink slots to a pre-configured value asresource pool information. For example, the all sidelink slots may besidelink slots in which S-SSB related resources are excluded. Forexample, the third information, the fourth information, and the fifthinformation may be configured to a pre-configured value as resource poolinformation. For example, by combining the fourth information and thefifth information, a common sidelink symbol configuration applied to allsidelink slots may be configured to a pre-configured value as resourcepool information. For example, the candidate slot may replace one ormore candidate slots.

According to an embodiment of the present disclosure, for eachcombination of the first to fifth information described above, the UEmay transmit the resource configuration information transmitted as thePSBCH payload as it is, the resource pool information may include bothresource configuration information transmitted through the PSBCH payloadand a pre-configured resource configuration information as resource poolinformation.

For example, the UE may transmit configuration information for candidatesidelink resources that can be used for sidelink communication among allresources through the PSBCH payload. For example, the PSBCH payload maybe pre-configured or configured for the UE by a higher layer signaling.In this case, for example, the configuration information for thecandidate sidelink resources may be information commonly applied to acell or a system. For example, the configuration information for thecandidate sidelink resources may be information in unit of slots.Alternatively, for example, the configuration information for thecandidate sidelink resources may be information including a slot unitand a symbol unit.

For example, resource pool information pre-configured by a higher layersignaling may include candidate sidelink resource configurationinformation (e.g., candidate sidelink resource configuration informationtransmitted through the PSBCH payload), slot-level bitmap informationconstituting the actual sidelink resource pool and symbol configurationfor slots constituting the actual sidelink resource pool (e.g., thenumber and positions of symbols in the sidelink slot, distribution ofcontiguous or non-contiguous sidelink symbols).

For example, based on the candidate sidelink resource informationtransmitted through the PSBCH payload, the UE may actually transmitsidelink resource pool information used for sidelink communication. Forexample, a resource constituting an actual sidelink resource pool may bedesignated in a form of a bit map for the candidate sidelink resources.In this case, for example, when the candidate sidelink resources areinformation configured in unit of slots, the information constitutingthe sidelink resource pool may include a bitmap in unit of slots.

For example, all sidelink slots constituting the sidelink resource poolmay have the same symbol configuration. That is, for example, the numberand position of sidelink symbols to be used for sidelink communicationin one sidelink slot may be fixed, and the same symbol configuration maybe applied to all sidelink slots.

In this case, for example, sidelink symbols in a sidelink slot may becomposed of continuous symbols or non-consecutive symbols. For example,in a case in which consecutive symbols are configured, configurationinformation related to consecutive symbols may be efficiently signaledaccording to various embodiments of the present disclosure. For example,when configured with non-consecutive symbols, the configurationinformation may be signaled in the form of a bit map.

In various embodiments of the present disclosure, the number of sidelinksymbols applied to a sidelink slot may be different based on whether ornot PSFCH is transmitted. More specifically, for example, regardless ofwhether the PSFCH is transmitted or not, the number of sidelink symbolsconstituting the PSCCH and the PSSCH may be the same for all sidelinkslots. For example, all sidelink slots may not include resources relatedto S-SSB. Therefore, reception coverage of the PSCCH and the PSSCH maynot be different according to the sidelink slot. In this case, forexample, when PSFCH is transmitted, sidelink symbols required for PSFCHtransmission may be additionally allocated to the sidelink slot. In thiscase, for example, the number of sidelink symbols required for PSFCHtransmission may be the same for all sidelink slots except for S-SSB.For example, the number of sidelink symbols required for PSFCHtransmission may be different for each sidelink slot based on a amountof data to be transmitted by the PSFCH. In this case, for example, thenumber of sidelink symbols to be used for the PSFCH may bepre-configured by a higher layer signaling.

In the present disclosure, the INC UE and the OOC UE may share sameinformation related to the TDD slot configuration. In order to performsidelink communication based on a resource composed of a sidelinkslot/symbol configured for sidelink communication, the UE canefficiently transmit information related to a TDD slot configurationthrough the PSBCH.

In addition, when the UE does not use the same number of symbols forsidelink communication in all sidelink slots except for resources fortransmitting S-SSB, since the base station or the UE needs to transmitinformation related to symbols used in every slot, a problem ofsignaling overhead may occur.

For example, a set of slots included in a sidelink resource pool may beall slots except for a slot in which an S-SSB is configured and anon-sidelink slot. For example, the non-sidelink slot may be a slot inwhich at least one of the Nth symbol to the N+M−1th OFDM symbol is notsemi-statically configured as a UL symbol according to a parameter of ahigher layer. Herein, for example, the UE may receive at least one ofinformation related to the N value or information related to the M valuefrom the base station. For example, the N may be a position of asidelink start symbol, and the M may be a length or number of sidelinksymbols.

FIG. 12 shows a procedure for a transmitting UE to transmit a PSSCH to areceiving UE based on information related to a TDD slot configuration,according to an embodiment of the present disclosure. FIG. 12 may becombined with various embodiments of the present disclosure.

Referring to FIG. 12 , in step S1210, the transmitting UE may receiveinformation related to a TDD slot configuration. For example, thetransmitting UE may receive information related to a TDD slotconfiguration from the base station. For example, the transmitting UEmay receive information related to a TDD slot configuration from thereceiving UE.

In step S1220, the transmitting UE may transmit a S-SSB to the receivingUE. For example, the S-SSB may include a sidelink primarysynchronization signal (S-PSS), a sidelink secondary synchronizationsignal (S-SSS), and a physical sidelink broadcast channel (PSBCH). Forexample, resources for transmitting the S-SSB may be pre-configured forthe transmitting UE by a higher layer. For example, resources fortransmitting the S-SSB may include resources in a frequency domain and atime domain.

For example, the transmitting UE may transmit information related to asidelink resource pool pre-configured by a higher layer to the receivingUE through the PSBCH. For example, the pre-configured informationrelated to the sidelink resource pool may be in a form of a bit map. Forexample, the transmitting UE may transmit information related to the TDDslot configuration to the receiving UE through the PSBCH. For example,the transmitting UE may transmit information on sidelink slots orsidelink symbols included in a sidelink resource pool among theinformation related to the TDD slot configuration to the receiving UEthrough the PSBCH. For example, the information on sidelink slots orsidelink symbols included in the sidelink resource pool among theinformation related to the TDD slot configuration may be in a form of abit map. For example, the bitmap may be configured based on any one of asubframe, a slot, or a symbol. For example, the bitmap may be configuredbased on any one of a subframe unit, a slot unit, or a symbol unit.

In step S1230, the transmitting UE may transmit a PSSCH to the receivingUE based on the information related to the TDD slot configuration. Forexample, candidate resources to which a bitmap related to a sidelinkresource pool is applied may be configured based on the informationrelated to the TDD slot configuration. For example, the candidateresources may include one or more slots. For example, configurationinformation related to a sidelink symbol included in each of the one ormore slots may be received. For example, the configuration informationrelated to the sidelink symbol may include information related to aposition of the sidelink symbol. For example, the position of thesidelink symbol may be identically configured for the candidateresources. For example, the information related to the TDD slotconfiguration may include at least one of a UL slot/symbol, a DLslot/symbol, or an SL slot/symbol. For example, the UL slot/symbolincluded in the information related to the TDD slot configuration may beconfigured as candidate resources to which a bitmap related to asidelink resource pool is applied.

For example, the transmitting UE may receive information related to aposition of a sidelink symbol included in each of one or more slots. Forexample, the transmitting UE may receive information related to aposition of a sidelink symbol included in each of one or more slots fromthe base station. For example, the information related to the positionof the sidelink symbol included in the each of one or more slots may bepre-configured for a transmitting UE. For example, the informationrelated to the position of the sidelink symbol included in the each ofone or more slots may be in a form of a bit map. For example, the bitmapmay be configured based on a symbol. For example, the bitmap may beconfigured based on a symbol unit.

FIG. 13 shows an example in which a sidelink symbol is allocated in asidelink slot according to an embodiment of the present disclosure. FIG.14 shows an example of a slot excluded from a sidelink slot according toan embodiment of the present disclosure. FIG. 13 and FIG. 14 may becombined with various embodiments of the present disclosure.

For example, the transmitting UE may receive information related to aTDD slot configuration to the base station. The transmitting UE maytransmit a PSSCH to the receiving UE using a sidelink slot based oninformation related to a TDD slot configuration. In this case, forexample, at least one UL slot among a plurality of slots included in theinformation related to the TDD slot configuration may be allocated as asidelink slot. For example, the UL slot may be determined based onparameters signaled by the UE from a higher layer. For example, theparameters may include a start symbol of sidelink symbols or a length ornumber of sidelink symbols.

Referring to FIG. 13 , one slot may include a plurality of symbols. Forexample, one slot may include 14 symbols. The use of each symbol for oneslot may be determined based on the TDD slot configuration. For example,when the transmitting UE may determine a start symbol for the sidelinksymbols as symbol #10 based on parameters signaled from a higher layerand the number of sidelink symbols is determined to be 4, if the symbolsof symbol #10 to symbol #13 are UL symbols, the transmitting UE may usesymbols #10 to #13 as sidelink symbols. That is, the transmitting UE mayuse the slot of FIG. 13 as a sidelink slot, and the transmitting UE maytransmit a PSSCH to the receiving UE on the sidelink slot. For example,the number of sidelink symbols in one slot signaled from a higher layermay be less than or equal to the number of pre-configured UL symbols inthe one slot. For example, based on positions of the sidelink symbolsand the number of sidelink symbols signaled from a higher layer, thetransmitting UE may determine a duration of the sidelink symbol. When asymbol in the duration of the sidelink symbol consists of a UL symbol,the transmitting UE may transmit a PSSCH to the receiving UE in theduration of the sidelink symbol.

Referring to FIG. 14 , when the transmitting UE may determine a startsymbol for the sidelink symbols as symbol #10 based on parameterssignaled from a higher layer and the number of sidelink symbols isdetermined to be 4, if there is a symbol for a different purpose otherthan a UL symbol among the symbols of symbols #10 to #13, thetransmitting UE cannot use a slot including the symbol as a sidelinkslot. That is, the slot of FIG. 14 cannot be used by the UE as asidelink slot. For example, based on positions of the sidelink symbolsand the number of sidelink symbols signaled from a higher layer, thetransmitting UE may determine a duration of the sidelink symbols in oneslot. In this case, when a symbol in the sidelink symbol duration in oneslot is composed of a symbol for a different purpose other than the ULsymbol (e.g., DL symbol (symbol #11, symbol #13), the one slot cannot beused as a sidelink slot.

FIG. 15 shows a method for a first device to transmit a PSSCH to asecond device based on information related to a TDD slot configurationaccording to an embodiment of the present disclosure. FIG. 15 may becombined with various embodiments of the present disclosure.

Referring to FIG. 15 , in step S1510, the first device 100 may receiveinformation related to a time division duplex (TDD) slot configuration.For example, the first device 100 may receive information related to aTDD slot configuration from the base station. For example, the firstdevice 100 may receive information related to a TDD slot configurationfrom the second device 200.

In step S1520, the first device 100 may transmit asidelink-synchronization signal block (S-SSB) to the second device 200.For example, the S-SSB may include a sidelink primary synchronizationsignal (S-PSS), a sidelink secondary synchronization signal (S-SSS), anda physical sidelink broadcast channel (PSBCH). For example, resourcesfor transmitting the S-SSB may be pre-configured by a higher layer. Forexample, resources for transmitting the S-SSB may include resources in afrequency domain and a time domain.

For example, the first device 100 may transmit information related to apre-configured sidelink resource pool by a higher layer to the seconddevice 200 through the PSBCH. For example, the information related tothe pre-configured sidelink resource pool may be in a form of a bit map.For example, the first device 100 may transmit the information relatedto the TDD slot configuration to the second device 200 through thePSBCH. For example, the first device 100 may transmit information on asidelink slot or a sidelink symbol included in a sidelink resource poolamong the information related to the TDD slot configuration to thesecond device 200 through the PSBCH. For example, the information on thesidelink slot or the sidelink symbol included in the sidelink resourcepool among the information related to the TDD slot configuration may bein a form of a bit map. For example, the bitmap may be configured basedon any one of a subframe unit, a slot unit, or a symbol unit.

In step S1530, the first device 100 may transmit a PSSCH to the seconddevice 200 based on based on the information related to the TDD slotconfiguration. For example, candidate resources to which a bitmaprelated to a sidelink resource pool is applied may be configured basedon the information related to the TDD slot configuration. For example,the candidate resources may include one or more slots. For example,configuration information related to a sidelink symbol included in eachof the one or more slots may be received. For example, the configurationinformation related to the sidelink symbol may include informationrelated to a position of the sidelink symbol. For example, the positionof the sidelink symbol may be configured to be the same for thecandidate resources. For example, the information related to the TDDslot configuration may include at least one of a UL slot/symbol, a DLslot/symbol, or a SL slot/symbol. For example, the UL slot/symbolincluded in the information related to the TDD slot configuration may beconfigured as candidate resources to which a bitmap related to asidelink resource pool is applied.

For example, the first device 100 may receive the information related tothe position of the sidelink symbol included in each of the one or moreslots. For example, the first device 100 may receive the informationrelated to the position of the sidelink symbol included in each of theone or more slots from the base station. For example, the informationrelated to the position of the sidelink symbol included in each of theone or more slots may be pre-configured. For example, the informationrelated to the position of the sidelink symbol included in each of theone or more slots may be in a form of a bit map. For example, the bitmapmay be configured based on a symbol unit.

For example, the configuration information related to the sidelinksymbol may further include information related to the number of sidelinksymbols. For example, the number of sidelink symbols may be configuredfor the candidate resources to be the same.

For example, the sidelink resource pool may be configured based on thecandidate resources. For example, resources for transmitting the S-SSBmay not be included in the sidelink resource pool.

The above-described embodiment may be applied to various devices to bedescribed below. First, for example, the processor 102 of the firstdevice 100 may control the transceiver 106 to transmit to receiveinformation related to a time division duplex (TDD) slot configuration.And, for example, the processor 102 of the first device 100 may controlthe transceiver 106 to transmit a sidelink-synchronization signal block(S-SSB) to the second device 200. And, for example, the processor 102 ofthe first device 100 may control the transceiver 106 to transmit a PSSCHto the second device 200 based on based on the information related tothe TDD slot configuration.

According to an embodiment of the present disclosure, a first deviceconfigured to perform wireless communication may be provided. Forexample, the first device may comprise: one or more memories storinginstructions; one or more transceivers; and one or more processorsconnected to the one or more memories and the one or more transceivers.For example, the one or more processors may execute the instructions to:receive information related to a time division duplex (TDD) slotconfiguration, transmit, to a second device, a sidelink-synchronizationsignal block (S-SSB), wherein the S-SSB includes a sidelink primarysynchronization signal (S-PSS), a sidelink secondary synchronizationsignal (S-SSS) and a physical sidelink broadcast channel (PSBCH),transmit, to the second device, a physical sidelink shared channel(PSSCH) based on the information related to the TDD slot configuration.For example, candidate resources to which a bitmap related to a sidelinkresource pool is applied are configured based on the information relatedto the TDD slot configuration. For example, the candidate resourcesinclude one or more slots. For example, configuration informationrelated to a sidelink symbol included in each of the one or more slotsis received. For example, the configuration information related to thesidelink symbol includes information related to a position of thesidelink symbol. For example, the position of the sidelink symbol isconfigured to be the same for the candidate resources.

According to an embodiment of the present disclosure, an apparatusconfigured to control a first user equipment (UE) may be provided. Forexample, the apparatus may comprise: one or more processors; and one ormore memories operably connected to the one or more processors andstoring instructions. For example, the one or more processors mayexecute the instructions to: receive information related to a timedivision duplex (TDD) slot configuration, transmit, to a second UE, asidelink-synchronization signal block (S-SSB), wherein the S-SSBincludes a sidelink primary synchronization signal (S-PSS), a sidelinksecondary synchronization signal (S-SSS) and a physical sidelinkbroadcast channel (PSBCH), transmit, to the second UE, a physicalsidelink shared channel (PSSCH) based on the information related to theTDD slot configuration. For example, candidate resources to which abitmap related to a sidelink resource pool is applied are configuredbased on the information related to the TDD slot configuration. Forexample, the candidate resources include one or more slots. For example,configuration information related to a sidelink symbol included in eachof the one or more slots is received. For example, the configurationinformation related to the sidelink symbol includes information relatedto a position of the sidelink symbol. For example, the position of thesidelink symbol is configured to be the same for the candidateresources.

According to an embodiment of the present disclosure, a non-transitorycomputer-readable storage medium storing instructions may be provided.For example, the instructions, when executed, cause a first device to:receive information related to a time division duplex (TDD) slotconfiguration, transmit, to a second device, a sidelink-synchronizationsignal block (S-SSB), wherein the S-SSB includes a sidelink primarysynchronization signal (S-PSS), a sidelink secondary synchronizationsignal (S-SSS) and a physical sidelink broadcast channel (PSBCH),transmit, to the second device, a physical sidelink shared channel(PSSCH) based on the information related to the TDD slot configuration.For example, candidate resources to which a bitmap related to a sidelinkresource pool is applied are configured based on the information relatedto the TDD slot configuration. For example, the candidate resourcesinclude one or more slots. For example, configuration informationrelated to a sidelink symbol included in each of the one or more slotsis received. For example, the configuration information related to thesidelink symbol includes information related to a position of thesidelink symbol. For example, the position of the sidelink symbol isconfigured to be the same for the candidate resources.

FIG. 16 shows a method for a second device to receive a PSSCH from afirst device based on information related to a TDD slot configurationaccording to an embodiment of the present disclosure. FIG. 16 may becombined with various embodiments of the present disclosure.

Referring to FIG. 16 , in step S1610, the second device 200 may receiveinformation related to a TDD slot configuration. For example, the seconddevice 200 may receive information related to a TDD slot configurationfrom the base station. For example, the second device 200 may receiveinformation related to a TDD slot configuration from the first device100.

In step S1620, the second device 200 may receive a S-SSB from the firstdevice 100. For example, the S-SSB may include a sidelink primarysynchronization signal (S-PSS), a sidelink secondary synchronizationsignal (S-SSS), and a physical sidelink broadcast channel (PSBCH). Forexample, resources for transmitting the S-SSB may be pre-configured by ahigher layer. For example, resources for transmitting the S-SSB mayinclude resources in a frequency domain and a time domain.

For example, the second device 200 may receive information related to apre-configured sidelink resource pool by a higher layer from the firstdevice 100 through the PSBCH. For example, the information related tothe pre-configured sidelink resource pool may be in a form of a bit map.For example, the second device 200 may receive the information relatedto the TDD slot configuration from the first device 100 through thePSBCH. For example, the second device 200 may receive information on asidelink slot or a sidelink symbol included in a sidelink resource poolamong the information related to the TDD slot configuration from thefirst device 100 through the PSBCH. For example, the information on thesidelink slot or the sidelink symbol included in the sidelink resourcepool among the information related to the TDD slot configuration may bein a form of a bit map. For example, the bitmap may be configured basedon any one of a subframe unit, a slot unit, or a symbol unit.

In step S1630, the second device 200 may receive a PSSCH from the firstdevice 100 based on based on the information related to the TDD slotconfiguration. For example, candidate resources to which a bitmaprelated to a sidelink resource pool is applied may be configured basedon the information related to the TDD slot configuration. For example,the candidate resources may include one or more slots. For example,configuration information related to a sidelink symbol included in eachof the one or more slots may be received. For example, the configurationinformation related to the sidelink symbol may include informationrelated to a position of the sidelink symbol. For example, the positionof the sidelink symbol may be configured to be the same for thecandidate resources. For example, the information related to the TDDslot configuration may include at least one of a UL slot/symbol, a DLslot/symbol, or a SL slot/symbol. For example, the UL slot/symbolincluded in the information related to the TDD slot configuration may beconfigured as candidate resources to which a bitmap related to asidelink resource pool is applied.

For example, the configuration information related to the sidelinksymbol may further include information related to the number of sidelinksymbols. For example, the number of sidelink symbols may be configuredfor the candidate resources to be the same.

For example, the sidelink resource pool may be configured based on thecandidate resources. For example, resources for transmitting the S-SSBmay not be included in the sidelink resource pool.

The above-described embodiment may be applied to various devices to bedescribed below. First, for example, the processor 202 of the seconddevice 200 may control the transceiver 206 to receive informationrelated to a TDD slot configuration. And, for example, the processor 202of the second device 200 may control the transceiver 206 to receive aS-SSB from the first device 100. And, for example, the processor 202 ofthe second device 200 may control the transceiver 206 to receive a PSSCHfrom the first device 100 based on based on the information related tothe TDD slot configuration

According to an embodiment of the present disclosure, a second deviceconfigured to perform wireless communication may be provided. Forexample, the second device may comprise: one or more memories storinginstructions; one or more transceivers; and one or more processorsconnected to the one or more memories and the one or more transceivers.For example, the one or more processors may execute the instructions to:receive information related to a time division duplex (TDD) slotconfiguration, receive, from a first device, a sidelink-synchronizationsignal block (S-SSB), wherein the S-SSB includes a sidelink primarysynchronization signal (S-PSS), a sidelink secondary synchronizationsignal (S-SSS) and a physical sidelink broadcast channel (PSBCH),receive, from the first device, a physical sidelink shared channel(PSSCH) based on the information related to the TDD slot configuration.For example, candidate resources to which a bitmap related to a sidelinkresource pool is applied are configured based on the information relatedto the TDD slot configuration. For example, the candidate resourcesinclude one or more slots. For example, configuration informationrelated to a sidelink symbol included in each of the one or more slotsis received. For example, the configuration information related to thesidelink symbol includes information related to a position of thesidelink symbol. For example, the position of the sidelink symbol isconfigured to be the same for the candidate resources.

Hereinafter, an apparatus to which various embodiments of the presentdisclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 17 shows a communication system 1, in accordance with an embodimentof the present disclosure.

Referring to FIG. 17 , a communication system 1 to which variousembodiments of the present disclosure are applied includes wirelessdevices, Base Stations (BSs), and a network. Herein, the wirelessdevices represent devices performing communication using Radio AccessTechnology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE))and may be referred to as communication/radio/5G devices. The wirelessdevices may include, without being limited to, a robot 100 a, vehicles100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-helddevice 100 d, a home appliance 100 e, an Internet of Things (IoT) device100 f, and an Artificial Intelligence (AI) device/server 400. Forexample, the vehicles may include a vehicle having a wirelesscommunication function, an autonomous vehicle, and a vehicle capable ofperforming communication between vehicles. Herein, the vehicles mayinclude an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR devicemay include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented in the form of a Head-Mounted Device(HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, asmartphone, a computer, a wearable device, a home appliance device, adigital signage, a vehicle, a robot, etc. The hand-held device mayinclude a smartphone, a smartpad, a wearable device (e.g., a smartwatchor a smartglasses), and a computer (e.g., a notebook). The homeappliance may include a TV, a refrigerator, and a washing machine. TheIoT device may include a sensor and a smartmeter. For example, the BSsand the network may be implemented as wireless devices and a specificwireless device 200 a may operate as a BS/network node with respect toother wireless devices.

Herein, the wireless communication technology implemented in thewireless device of the present specification may include a narrowbandInternet of Things for low-power communication as well as LTE, NR, and6G. In this case, for example, the NB-IoT technology may be an exampleof a Low Power Wide Area Network (LPWAN) technology, and may beimplemented in standards such as LTE Cat NB1 and/or LTE Cat NB2, and isnot limited to the above-described name. Additionally or alternatively,the wireless communication technology implemented in the wireless deviceof the present specification may perform communication based on LTE-Mtechnology. In this case, as an example, the LTE-M technology may be anexample of an LPWAN technology, and may be called by various names suchas enhanced machine type communication (eMTC). LTE-M technology may beimplemented in at least one of 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE CatM2, 4) LTE non-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE MachineType Communication, and/or 7) LTE M, and is not limited to theabove-mentioned name. Additionally or alternatively, the wirelesscommunication technology implemented in the wireless device of thisspecification may include at least one of ZigBee, Bluetooth, and LowPower Wide Area Network (LPWAN) and is not limited to theabove-mentioned name. For example, the ZigBee technology may createpersonal area networks (PAN) related to small/low-power digitalcommunication based on various standards such as IEEE 802.15.4, and canbe called by various names.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul(IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 18 shows wireless devices, in accordance with an embodiment of thepresent disclosure.

Referring to FIG. 18 , a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 17 .

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

FIG. 19 shows a signal process circuit for a transmission signal, inaccordance with an embodiment of the present disclosure.

Referring to FIG. 19 , a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 19 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 18 . Hardwareelements of FIG. 19 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 18 . For example, blocks1010 to 1060 may be implemented by the processors 102 and 202 of FIG. 18. Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 18 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 18 .

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 19 . Herein, the codewords are encoded bitsequences of information blocks. The information blocks may includetransport blocks (e.g., a UL-SCH transport block, a DL-SCH transportblock). The radio signals may be transmitted through various physicalchannels (e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 19 . For example, the wireless devices(e.g., 100 and 200 of FIG. 18 ) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

FIG. 20 shows another example of a wireless device, in accordance withan embodiment of the present disclosure. The wireless device may beimplemented in various forms according to a use-case/service (refer toFIG. 17 ).

Referring to FIG. 20 , wireless devices 100 and 200 may correspond tothe wireless devices 100 and 200 of FIG. 18 and may be configured byvarious elements, components, units/portions, and/or modules. Forexample, each of the wireless devices 100 and 200 may include acommunication unit 110, a control unit 120, a memory unit 130, andadditional components 140. The communication unit may include acommunication circuit 112 and transceiver(s) 114. For example, thecommunication circuit 112 may include the one or more processors 102 and202 and/or the one or more memories 104 and 204 of FIG. 18 . Forexample, the transceiver(s) 114 may include the one or more transceivers106 and 206 and/or the one or more antennas 108 and 208 of FIG. 18 . Thecontrol unit 120 is electrically connected to the communication unit110, the memory 130, and the additional components 140 and controlsoverall operation of the wireless devices. For example, the control unit120 may control an electric/mechanical operation of the wireless devicebased on programs/code/commands/information stored in the memory unit130. The control unit 120 may transmit the information stored in thememory unit 130 to the exterior (e.g., other communication devices) viathe communication unit 110 through a wireless/wired interface or store,in the memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 17 ), the vehicles (100 b-1 and 100 b-2 of FIG. 17 ), the XRdevice (100 c of FIG. 17 ), the hand-held device (100 d of FIG. 17 ),the home appliance (100 e of FIG. 17 ), the IoT device (100 f of FIG. 17), a digital broadcast terminal, a hologram device, a public safetydevice, an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 17 ), the BSs (200 of FIG. 17 ), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 20 , the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 20 will be described indetail with reference to the drawings.

FIG. 21 shows a hand-held device, in accordance with an embodiment ofthe present disclosure. The hand-held device may include a smartphone, asmartpad, a wearable device (e.g., a smartwatch or a smartglasses), or aportable computer (e.g., a notebook). The hand-held device may bereferred to as a mobile station (MS), a user terminal (UT), a MobileSubscriber Station (MSS), a Subscriber Station (SS), an Advanced MobileStation (AMS), or a Wireless Terminal (WT).

Referring to FIG. 21 , a hand-held device 100 may include an antennaunit 108, a communication unit 110, a control unit 120, a memory unit130, a power supply unit 140 a, an interface unit 140 b, and an I/O unit140 c. The antenna unit 108 may be configured as a part of thecommunication unit 110. Blocks 110 to 130/140 a to 140 c correspond tothe blocks 110 to 130/140 of FIG. 20 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signals, audio information/signals, data, and/or informationinput by a user. The I/O unit 140 c may include a camera, a microphone,a user input unit, a display unit 140 d, a speaker, and/or a hapticmodule.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

FIG. 22 shows a vehicle or an autonomous vehicle, in accordance with anembodiment of the present disclosure. The vehicle or autonomous vehiclemay be implemented by a mobile robot, a car, a train, a manned/unmannedAerial Vehicle (AV), a ship, etc.

Referring to FIG. 22 , a vehicle or autonomous vehicle 100 may includean antenna unit 108, a communication unit 110, a control unit 120, adriving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, andan autonomous driving unit 140 d. The antenna unit 108 may be configuredas a part of the communication unit 110. The blocks 110/130/140 a to 140d correspond to the blocks 110/130/140 of FIG. 20 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous vehicle 100. The control unit 120 may includean Electronic Control Unit (ECU). The driving unit 140 a may cause thevehicle or the autonomous vehicle 100 to drive on a road. The drivingunit 140 a may include an engine, a motor, a powertrain, a wheel, abrake, a steering device, etc. The power supply unit 140 b may supplypower to the vehicle or the autonomous vehicle 100 and include awired/wireless charging circuit, a battery, etc. The sensor unit 140 cmay acquire a vehicle state, ambient environment information, userinformation, etc. The sensor unit 140 c may include an InertialMeasurement Unit (IMU) sensor, a collision sensor, a wheel sensor, aspeed sensor, a slope sensor, a weight sensor, a heading sensor, aposition module, a vehicle forward/backward sensor, a battery sensor, afuel sensor, a tire sensor, a steering sensor, a temperature sensor, ahumidity sensor, an ultrasonic sensor, an illumination sensor, a pedalposition sensor, etc. The autonomous driving unit 140 d may implementtechnology for maintaining a lane on which a vehicle is driving,technology for automatically adjusting speed, such as adaptive cruisecontrol, technology for autonomously driving along a determined path,technology for driving by automatically setting a path if a destinationis set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous vehicle 100 may movealong the autonomous driving path according to the driving plan (e.g.,speed/direction control). In the middle of autonomous driving, thecommunication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous vehicles and provide the predicted traffic information datato the vehicles or the autonomous vehicles.

Claims in the present description can be combined in a various way. Forinstance, technical features in method claims of the present descriptioncan be combined to be implemented or performed in an apparatus, andtechnical features in apparatus claims can be combined to be implementedor performed in a method. Further, technical features in method claim(s)and apparatus claim(s) can be combined to be implemented or performed inan apparatus. Further, technical features in method claim(s) andapparatus claim(s) can be combined to be implemented or performed in amethod.

What is claimed is:
 1. A method for performing wireless communication bya second device, the method comprising: obtaining information related toa starting symbol used for sidelink and information related to a numberof symbols used for sidelink; receiving, from a first device, asidelink-synchronization signal block (S-SSB), wherein the S-SSBincludes a sidelink primary synchronization signal (S-PSS), a sidelinksecondary synchronization signal (S-SSS) and a physical sidelinkbroadcast channel (PSBCH) including a sidelink time division duplex(TDD) configuration; and receiving, from the first device, a physicalsidelink shared channel (PSSCH) in a sidelink resource pool, wherein aset of slots assigned to the sidelink resource pool is determined, basedon the sidelink TDD configuration, wherein the sidelink resource poolincludes a plurality of slots, and wherein the starting symbol used forsidelink included in each of the plurality of slots and the number ofsymbols used for sidelink included in each of the plurality of slots areconfigured to be constant in the sidelink resource pool.
 2. The methodof claim 1, wherein the information related to the starting symbol usedfor sidelink is in a form of a bitmap.
 3. The method of claim 2, whereinthe bitmap is configured based on a symbol unit.
 4. The method of claim1, wherein a resource for receiving the S-SSB is pre-configured by ahigher layer.
 5. The method of claim 1, wherein a resource for receivingthe S-SSB includes a resource in a frequency domain and in a timedomain.
 6. The method of claim 1, wherein information related to apre-configured sidelink resource pool by a higher layer is received fromthe first device through the PSBCH.
 7. The method of claim 6, whereinthe information related to the pre-configured sidelink resource pool isin a form of a bitmap.
 8. The method of claim 1, wherein information ona sidelink slot or a sidelink symbol included in the sidelink resourcepool among the sidelink TDD configuration is received from the firstdevice through the PSBCH.
 9. The method of claim 8, wherein theinformation on the sidelink slot or the sidelink symbol included in thesidelink resource pool among the sidelink TDD configuration is in a formof a bitmap.
 10. The method of claim 9, wherein the bitmap is configuredbased on any one of a subframe unit, a slot unit, or a symbol unit. 11.The method of claim 1, wherein the sidelink resource pool is configuredbased on the set of slots.
 12. The method of claim 11, wherein aresource for receiving the S-SSB is not included in the sidelinkresource pool.
 13. A second device for performing wirelesscommunication, the second device comprising: at least one transceiver;at least one processor; and at least one memory operably connected tothe at least one processor and storing instructions that, based on beingexecuted by the at least one processor, cause the second first device toperform operations, wherein the operations comprise: obtaininginformation related to a starting symbol used for sidelink andinformation related to a number of symbols used for sidelink; receiving,from a first device, a sidelink-synchronization signal block (S-SSB),wherein the S-SSB includes a sidelink primary synchronization signal(S-PSS), a sidelink secondary synchronization signal (S-SSS) and aphysical sidelink broadcast channel (PSBCH) including a sidelink timedivision duplex (TDD) configuration; and receiving, from the firstdevice, a physical sidelink shared channel (PSSCH) in a sidelinkresource pool, wherein a set of slots assigned to the sidelink resourcepool is determined, based on the sidelink TDD configuration, wherein thesidelink resource pool includes a plurality of slots, and wherein thestarting symbol used for sidelink included in each of the plurality ofslots and the number of symbols used for sidelink included in each ofthe plurality of slots are configured to be constant in the sidelinkresource pool.
 14. The second device of claim 13, wherein theinformation related to the starting symbol used for sidelink is in aform of a bitmap.
 15. A device adapted to control a second userequipment (UE), the device comprising: at least one processor; and atleast one memory operably connected to the at least one processor andstoring instructions that, based on being executed by the at least oneprocessor, cause the second UE to perform operations, wherein theoperations comprise: obtaining information related to a starting symbolused for sidelink and information related to a number of symbols usedfor sidelink; receiving, from a first device, a sidelink-synchronizationsignal block (S-SSB), wherein the S-SSB includes a sidelink primarysynchronization signal (S-PSS), a sidelink secondary synchronizationsignal (S-SSS) and a physical sidelink broadcast channel (PSBCH)including a sidelink time division duplex (TDD) configuration; andreceiving, from the first device, a physical sidelink shared channel(PSSCH) in a sidelink resource pool, wherein a set of slots assigned tothe sidelink resource pool is determined, based on the sidelink TDDconfiguration, wherein the sidelink resource pool includes a pluralityof slots, and wherein the starting symbol used for sidelink included ineach of the plurality of slots and the number of symbols used forsidelink included in each of the plurality of slots are configured to beconstant in the sidelink resource pool.